I think people has to be consequent with their ideas, since the upcoming of JS to Steem I left to post there event a comment, if you support this plattform is imo hypocritical to try to milk STEEM meanwhile. Thats my opinion, Arcange's is that the people who do that don't deserve his support I'm fine with that don't see in that a Nazi behaviour, is his choice and people should respect that.
I won't take part in a blacklist like this though, because I think that the first thing to do in this case should be first, expose his opinion in the post and second try to convince people that doing that is wrong.
If people continues posting in both plattforms then a blacklist to un-support them would be more reasonable.
Make the information available and people can make their own decisions.